HYDROMETERS/ REFRACTOMETERS

Aquarium Hydrometers

Aquarium Hydrometers measure the salinity in a fish tank by measuring the specific gravity. Specific gravity is defined as the ration of the weight of one liter of seawater to that of one liter of pure water at a specified temperature.

A new hydrometer will be accurate only to a certain degree, usually measured in PPT's (parts per thousand); if you want more precise accuracy, you should use a Refractometer. Hydrometers will lose their accuracy over time, so you will want to calibrate your hydrometer on a monthly basis. You can determine if your hydrometer is working correctly by testing it with distilled freshwater, which should be 1.000 after correcting for temperature.

OCReef Pro Salinity Refractometer - Specifically designed for saltwater aquarium use, for measuring the salinity of Natural Seawater. Includes: Precision Honed Inner Lens, and Black Soft Carrying Case. Comes with either a blue grip handle or a black grip handle, depending on stock available when the order is placed.

JBJ C-Scope Salinity Refractometer With Auto Temp. Calibration - From the fine line of quality JBJ products is the JBJ C-Scope Salinity Refractometer, measures your saltwater aquarium with precise accuracy. The C-Scope refractometer is designed for testing the concentrations of saltwater by providing a direct
reading of the speciific gravity and salinity in ppt.